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AS73211

Functional Description

Datasheet

• PUBLIC

DS000556

• v3-01 • 2018-Feb-07

│ 28

Figure 28:

Principle Sequence of Measurement in SYND Mode Ready for Wake-Up After Switch Off Power

Down State

7.13

Transfer Function

In generally the implemented A/D converter represents a delta-sigma converter, which performs

charge balancing between the input light at the photodiodes and an internal reference. The input

currents of the photodiodes result in pulse density modulated digital signals, further filtered by

counters up to 24 bits. At the end,

each channel’s counter status represents a digital equivalent of the

average input light irradiance regarding to the channe

l’s sensor area within the conversion time

interval. The input light irradiance can be calculated from the measurement result by:

Equation 1:

MRES

FSR

MRES

CLK





Equation 2:

MRES

FSR

CLK

CONV





STANDBY

PAUSE

MEASUREMENT 2

STATE

READY

TCONV

MEASUREMENT 1

TSTARTSB

TBREAK

MRES1 …

MRES3

RESULTS 1

I²C activity

data

fetch

RESULT 1

OSR

83h

start

SYN

TSTARTSB

CONFIGURATION

STANDBY

OUTCONV

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